/* tls_o.c - Handle tls/ssl using OpenSSL */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2008-2011 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* ACKNOWLEDGEMENTS: Rewritten by Howard Chu
 */

#include "portable.h"

#ifdef HAVE_OPENSSL

#include "ldap_config.h"

#include <stdio.h>

#include <ac/stdlib.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/ctype.h>
#include <ac/time.h>
#include <ac/unistd.h>
#include <ac/param.h>
#include <ac/dirent.h>

#include "ldap-int.h"
#include "ldap-tls.h"

#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/safestack.h>
#elif defined( HAVE_SSL_H )
#include <ssl.h>
#endif

#ifdef __APPLE__
#include <Security/Security.h>
#include <syslog.h>

static int tlso_use_cert_from_keychain( struct ldapoptions *lo );
static X509 *tslo_copy_cert_to_x509(SecCertificateRef inRef);
static OSStatus tslo_create_ca_chain(SSL_CTX* ctx, SecCertificateRef sslCertRef);
static EVP_PKEY	*tslo_copy_key_to_evpkey(SecKeyRef inKey);
#endif

typedef SSL_CTX tlso_ctx;
typedef SSL tlso_session;

static int  tlso_opt_trace = 1;

static void tlso_report_error( void );

static void tlso_info_cb( const SSL *ssl, int where, int ret );
static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx );
static int tlso_pphrase_cb( char *buf, int bufsize, int verify );
static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx );
static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
EVP_PKEY *SSL_read_PrivateKey(FILE *fp, EVP_PKEY **key, int (*cb)());
static DH * tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length );

typedef struct dhplist {
	struct dhplist *next;
	int keylength;
	DH *param;
} dhplist;

static dhplist *tlso_dhparams;

static int tlso_seed_PRNG( const char *randfile );

#ifdef LDAP_R_COMPILE
/*
 * provide mutexes for the OpenSSL library.
 */
static ldap_pvt_thread_mutex_t	tlso_mutexes[CRYPTO_NUM_LOCKS];
static ldap_pvt_thread_mutex_t	tlso_dh_mutex;

static void tlso_locking_cb( int mode, int type, const char *file, int line )
{
	if ( mode & CRYPTO_LOCK ) {
		ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] );
	} else {
		ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] );
	}
}

static unsigned long tlso_thread_self( void )
{
	/* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t
	 * is an integral type that fits in an unsigned long
	 */

	/* force an error if the ldap_pvt_thread_t type is too large */
	enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) };
	typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1];

	return (unsigned long) ldap_pvt_thread_self();
}

static void tlso_thr_init( void )
{
	int i;

	for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
		ldap_pvt_thread_mutex_init( &tlso_mutexes[i] );
	}
	ldap_pvt_thread_mutex_init( &tlso_dh_mutex );
	CRYPTO_set_locking_callback( tlso_locking_cb );
	CRYPTO_set_id_callback( tlso_thread_self );
}
#endif /* LDAP_R_COMPILE */

/*Apple Specific code*/

EVP_PKEY *SSL_read_PrivateKey(FILE *fp, EVP_PKEY **key, int (*cb)())
{
    EVP_PKEY *rc;
    BIO *bioS;
    BIO *bioF;
	
    /* 1. try PEM (= DER+Base64+headers) */
    rc = PEM_read_PrivateKey(fp, key, cb, NULL);
    if (rc == NULL) {
        /* 2. try DER+Base64 */
        fseek(fp, 0L, SEEK_SET);
        if ((bioS = BIO_new(BIO_s_fd())) == NULL)
            return NULL;
        BIO_set_fd(bioS, fileno(fp), BIO_NOCLOSE);
        if ((bioF = BIO_new(BIO_f_base64())) == NULL) {
            BIO_free(bioS);
            return NULL;
        }
        bioS = BIO_push(bioF, bioS);
        rc = d2i_PrivateKey_bio(bioS, NULL);
        BIO_free_all(bioS);
        if (rc == NULL) {
            /* 3. try plain DER */
            fseek(fp, 0L, SEEK_SET);
            if ((bioS = BIO_new(BIO_s_fd())) == NULL)
                return NULL;
            BIO_set_fd(bioS, fileno(fp), BIO_NOCLOSE);
            rc = d2i_PrivateKey_bio(bioS, NULL);
            BIO_free(bioS);
        }
    }
    if (rc != NULL && key != NULL) {
        if (*key != NULL)
            EVP_PKEY_free(*key);
        *key = rc;
    }
    return rc;
}

#define SYSTEM_KEYCHAIN_PATH  "/Library/Keychains/System.keychain"
int tlso_pphrase_cb( char *buf, int bufsize, int verify )
{
    int len = -1;
	struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
	/*
     * When a remembered passphrase is available, use it
     */
    if (lo->ldo_tls_passphrase != NULL) {
        
        SecKeychainRef keychainRef = NULL;
        OSStatus status = SecKeychainOpen( SYSTEM_KEYCHAIN_PATH, &keychainRef );
        if ( status != errSecSuccess ) {
            Debug( LDAP_DEBUG_ANY, "TLS: SecKeychainOpen failed for keychain %s: %d",
                  SYSTEM_KEYCHAIN_PATH, (int)status, 0 );
            syslog( LOG_ERR, "TLS: SecKeychainOpen failed for keychain %s: %d",
                   SYSTEM_KEYCHAIN_PATH, (int)status, 0 );
            cssmPerror( "SecKeychainOpen", status );
            return len;
        }
        char *keychain_identifier = LDAP_STRDUP(lo->ldo_tls_passphrase);
        CFStringRef keychainCFName = CFStringCreateWithCString(NULL, keychain_identifier, kCFStringEncodingUTF8);
        if(keychainCFName)
        {
            CFRange foundRange;
            if(CFStringFindWithOptions(keychainCFName, CFSTR("."), CFRangeMake(0, CFStringGetLength(keychainCFName)), kCFCompareCaseInsensitive, &foundRange) == true)
            {
                CFStringRef itemName = CFStringCreateWithSubstring(NULL, keychainCFName, CFRangeMake(0, foundRange.location));
                CFStringRef accountName = CFStringCreateWithSubstring(NULL, keychainCFName, CFRangeMake(foundRange.location + 1, CFStringGetLength(keychainCFName) - foundRange.location));
                char *item_name, *account_name;
                void *passphraseBytes = nil;
                UInt32 passphraseLength = 0;
                
                if(itemName)
                {
                    int length = CFStringGetLength(itemName);
                    item_name = (char*)calloc(1, length + 1);
                    CFStringGetCString(itemName, item_name, length +1, kCFStringEncodingUTF8);
                }
                if(accountName)
                {
                    int length = CFStringGetLength(accountName);
                    account_name = (char*)calloc(1, length + 1);
                    CFStringGetCString(accountName, account_name, length +1, kCFStringEncodingUTF8);
                }
                status = SecKeychainFindGenericPassword(keychainRef, 
                                                     strlen(item_name),item_name ,
                                                     strlen(account_name), account_name,
                                                     &passphraseLength, &passphraseBytes, nil);
                if(status == 0)
                {
                    if(passphraseLength < bufsize)
                    {
                        memcpy(buf, passphraseBytes, passphraseLength);
                        buf[passphraseLength] ='\0';
                        len = strlen( buf );
                    }
                    SecKeychainItemFreeContent(nil, passphraseBytes);
                }
                if(item_name)
                    free(item_name);
                if(account_name)
                    free(account_name);
                if(keychain_identifier)
                    LDAP_FREE(keychain_identifier);
            }
        }
    }
    /*
     * Ok, we now have the pass phrase
     * so return its length to OpenSSL...
     */
    return len;
}
/* Apple Specific code end*/

static STACK_OF(X509_NAME) *
tlso_ca_list( char * bundle, char * dir )
{
	STACK_OF(X509_NAME) *ca_list = NULL;

	if ( bundle ) {
		ca_list = SSL_load_client_CA_file( bundle );
	}
#if defined(HAVE_DIRENT_H) || defined(dirent)
	if ( dir ) {
		int freeit = 0;

		if ( !ca_list ) {
			ca_list = sk_X509_NAME_new_null();
			freeit = 1;
		}
		if ( !SSL_add_dir_cert_subjects_to_stack( ca_list, dir ) &&
			freeit ) {
			sk_X509_NAME_free( ca_list );
			ca_list = NULL;
		}
	}
#endif
	return ca_list;
}

/*
 * Initialize TLS subsystem. Should be called only once.
 */
static int
tlso_init( void )
{
	struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();   
#ifdef HAVE_EBCDIC
	{
		char *file = LDAP_STRDUP( lo->ldo_tls_randfile );
		if ( file ) __atoe( file );
		(void) tlso_seed_PRNG( file );
		LDAP_FREE( file );
	}
#else
	(void) tlso_seed_PRNG( lo->ldo_tls_randfile );
#endif

	SSL_load_error_strings();
	SSL_library_init();
    OpenSSL_add_all_algorithms();
	OpenSSL_add_all_digests();

	/* FIXME: mod_ssl does this */
	X509V3_add_standard_extensions();

	return 0;
}

/*
 * Tear down the TLS subsystem. Should only be called once.
 */
static void
tlso_destroy( void )
{
	struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();   

	EVP_cleanup();
	ERR_remove_state(0);
	ERR_free_strings();

	if ( lo->ldo_tls_randfile ) {
		LDAP_FREE( lo->ldo_tls_randfile );
		lo->ldo_tls_randfile = NULL;
	}
	if ( lo->ldo_tls_passphrase ) {
		memset( lo->ldo_tls_passphrase, 0, strlen(lo->ldo_tls_passphrase));
		LDAP_FREE( lo->ldo_tls_passphrase );
		lo->ldo_tls_passphrase = NULL;
	}
	
}

static tls_ctx *
tlso_ctx_new( struct ldapoptions *lo )
{
	return (tls_ctx *) SSL_CTX_new( SSLv23_method() );
}

static void
tlso_ctx_ref( tls_ctx *ctx )
{
	tlso_ctx *c = (tlso_ctx *)ctx;
	CRYPTO_add( &c->references, 1, CRYPTO_LOCK_SSL_CTX );
}

static void
tlso_ctx_free ( tls_ctx *ctx )
{
	tlso_ctx *c = (tlso_ctx *)ctx;
	SSL_CTX_free( c );
}

/*
 * initialize a new TLS context
 */
static int
tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server )
{
	tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx;
	int i;

	if ( is_server ) {
		SSL_CTX_set_session_id_context( ctx,
			(const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
	}

	if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
		SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 );
	else if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 )
		SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 );

	if ( lo->ldo_tls_ciphersuite &&
		!SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) )
	{
		Debug( LDAP_DEBUG_ANY,
			   "TLS: could not set cipher list %s.\n",
			   lo->ldo_tls_ciphersuite, 0, 0 );
		tlso_report_error();
		return -1;
	}
#ifdef __APPLE__
    /* ldo_tls_server_ident_ref_name should only be set for servers. */
    /* Since this is server-only, using syslog() instead of Debug(). */
    if(lo->ldo_tls_server_ident_ref_name != NULL)
    {        
        OSStatus status = errSecSuccess;
        SecIdentityRef sslIdentityRef = NULL;
        X509 *x509_cert = NULL;
        SecCertificateRef certRef = NULL;
        SecKeyRef keyRef = NULL;
        EVP_PKEY	*pvtKey = NULL;
        
        SecKeychainSetUserInteractionAllowed(false);
        SecKeychainSetPreferenceDomain(kSecPreferencesDomainSystem);
        
        sslIdentityRef = SecIdentityCopyPreferred(CFSTR("OPENDIRECTORY_SSL_IDENTITY"), 0, NULL);
        if (sslIdentityRef) {
            syslog(LOG_DEBUG, "TLS: found identity in keychain using identity preference.");
        }
        else {
            syslog(LOG_DEBUG,
                   "TLS: failed to find identity in keychain using identity preference.  Trying to find identity by name '%s'.",
                   lo->ldo_tls_server_ident_ref_name);

            /* The identity name may be preceeded by "APPLE:".  If so, strip that part. */
            char *sep = strchr(lo->ldo_tls_server_ident_ref_name, ':');
            char *cIdentityName = sep ? sep + 1 : lo->ldo_tls_server_ident_ref_name;
            CFStringRef identityName = CFStringCreateWithCString(NULL, cIdentityName, kCFStringEncodingUTF8);
            if (!identityName) {
                syslog(LOG_NOTICE,
                       "TLS: failed to create CFString version of identity name %s.",
                       lo->ldo_tls_server_ident_ref_name);
            }
            else {
                CFMutableDictionaryRef query = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
                CFDictionaryAddValue(query, kSecClass, kSecClassIdentity);
                CFDictionaryAddValue(query, kSecReturnRef, kCFBooleanTrue);
                CFDictionaryAddValue(query, kSecMatchLimit, kSecMatchLimitOne);
                CFDictionaryAddValue(query, kSecMatchSubjectContains, identityName);

                /* Always want to specify the system keychain to protect ourselves from
                 * damage done to the keychain search list by Server.app & friends.
                 */
                SecKeychainRef keychainRef = NULL;
                status = SecKeychainOpen(SYSTEM_KEYCHAIN_PATH, &keychainRef);
                if (status == errSecSuccess) {
                    CFArrayRef searchList = CFArrayCreate(kCFAllocatorDefault, (const void**)&keychainRef, 1, &kCFTypeArrayCallBacks);
                    if (searchList) {
                        CFDictionaryAddValue(query, kSecMatchSearchList, searchList);
                        CFRelease(searchList);
                    }
                }

                CFTypeRef results = NULL;
                status = SecItemCopyMatching(query, &results);
                if(status != noErr) {
                    syslog(LOG_NOTICE,
                           "TLS: SecItemCopyMatching returned error %d when searching for identity %s.",
                           status, lo->ldo_tls_server_ident_ref_name);
                }
                else if (!results) {
                    syslog(LOG_NOTICE,
                           "TLS: failed to find identity using name %s: no results returned.",
                           lo->ldo_tls_server_ident_ref_name);
                }
                else {
                    if (CFGetTypeID(results) == SecIdentityGetTypeID()) {
                        sslIdentityRef  = (SecIdentityRef)results;
                        CFRetain(sslIdentityRef);
                    }
                    else if (CFGetTypeID(results) == CFArrayGetTypeID()) {
                        if (CFArrayGetCount(results) != 0) {
                            sslIdentityRef = (SecIdentityRef)CFArrayGetValueAtIndex(results, 0);
                            CFRetain(sslIdentityRef);
                        }
                        else {
                            syslog(LOG_NOTICE,
                                   "TLS: failed to find identity using name %s: empty array returned.",
                                   lo->ldo_tls_server_ident_ref_name);
                        }
                    }
                    else {
                        syslog(LOG_DEBUG, "TLS: SecItemCopyMatching returned unhandled type.");
                    }
                }

                CFRelease(identityName);
                CFRelease(query);
            }

            if (sslIdentityRef) {
                syslog(LOG_DEBUG,
                       "TLS: found identity in keychain by name '%s'.",
                       lo->ldo_tls_server_ident_ref_name);
            }
            else {
                syslog(LOG_NOTICE, "TLS: failed to find ssl identity in keychain.");
                return LDAP_TLS_KEYCHAIN_CERT_NOTFOUND;
            }
        }

        status = SecIdentityCopyCertificate(sslIdentityRef, &certRef);
        if(status)
        {
            syslog(LOG_NOTICE,
                  "TLS: could not copy certificate from keychain identity '%s'.",
                  lo->ldo_tls_server_ident_ref_name);
            goto done;
        }
        x509_cert = tslo_copy_cert_to_x509(certRef);

        status = tslo_create_ca_chain(ctx, certRef);
        if(status != noErr) {
            syslog(LOG_NOTICE,
                  "TLS: failed to create ca chain for '%s'.",
                  lo->ldo_tls_server_ident_ref_name);
            goto done;
        }

        if(!SSL_CTX_use_certificate(ctx, x509_cert))
        {
            syslog(LOG_NOTICE,
                  "TLS: could not use certificate '%s'.",
                  lo->ldo_tls_server_ident_ref_name);
            tlso_report_error();
            status = -1;
            goto done;
        }
        status = SecIdentityCopyPrivateKey(sslIdentityRef, &keyRef);
        if(status != noErr)
        {
            syslog(LOG_NOTICE,
                  "TLS: could not retrieve pvt key for '%s' from system keychain.",
                  lo->ldo_tls_server_ident_ref_name);
            goto done;
        }
        pvtKey = tslo_copy_key_to_evpkey(keyRef);
        if(!pvtKey)
        {
            syslog(LOG_NOTICE,
                  "TLS: could not convert keychain item '%s' to EVP_PKEY.",
                  lo->ldo_tls_server_ident_ref_name);
            tlso_report_error();
            status = -1;
            goto done;
        }
        if (!SSL_CTX_use_PrivateKey( lo->ldo_tls_ctx, pvtKey ) )
        {
            syslog(LOG_NOTICE,
                  "TLS: could not use pvt key '%s'.",
                  lo->ldo_tls_server_ident_ref_name);
            tlso_report_error();
            status = -1;
            goto done;
        }
        if (!SSL_CTX_check_private_key(lo->ldo_tls_ctx) )
        {
            syslog(LOG_NOTICE,
                  "TLS: pvt key doesn't match public key '%s'.",
                  lo->ldo_tls_server_ident_ref_name);
            tlso_report_error();
            status = -1;
        }
done:
        if(pvtKey)
             EVP_PKEY_free(pvtKey);
        if(keyRef)
            CFRelease(keyRef);
        if(x509_cert)
            X509_free(x509_cert);
        if(certRef)
           CFRelease(certRef);
        if(sslIdentityRef)
            CFRelease(sslIdentityRef);
        if(status != noErr)
            return -1;
    }
    else
    {
#endif
        if (lo->ldo_tls_cacertfile != NULL || lo->ldo_tls_cacertdir != NULL) {
            if ( !SSL_CTX_load_verify_locations( ctx,
                    lt->lt_cacertfile, lt->lt_cacertdir ) ||
                !SSL_CTX_set_default_verify_paths( ctx ) )
            {
                Debug( LDAP_DEBUG_ANY, "TLS: "
                    "could not load verify locations (file:`%s',dir:`%s').\n",
                    lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
                    lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
                    0 );
                tlso_report_error();
                return -1;
            }

            if ( is_server ) {
                STACK_OF(X509_NAME) *calist;
                /* List of CA names to send to a client */
                calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir );
                if ( !calist ) {
                    Debug( LDAP_DEBUG_ANY, "TLS: "
                        "could not load client CA list (file:`%s',dir:`%s').\n",
                        lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
                        lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
                        0 );
                    tlso_report_error();
                    return -1;
                }

                SSL_CTX_set_client_CA_list( ctx, calist );
            }
        }

        if ( lo->ldo_tls_certfile &&
            !SSL_CTX_use_certificate_file( ctx,
                lt->lt_certfile, SSL_FILETYPE_PEM ) )
        {
            Debug( LDAP_DEBUG_ANY,
                "TLS: could not use certificate `%s'.\n",
                lo->ldo_tls_certfile,0,0);
            tlso_report_error();
            return -1;
        }

        /* Key validity is checked automatically if cert has already been set */
        if ( lo->ldo_tls_keyfile )
        {
            FILE *fp;                                                             			
            EVP_PKEY *privatekey;                                                 			
            int success;                                                          			
            
            Debug( LDAP_DEBUG_ANY,
                  "TLS: attempting to read `%s'.\n",
                  lo->ldo_tls_keyfile,0,0);
            /*                                                                    			
             * Try to read the private key file with the help of                  			
             * the callback function which serves the pass                        			
             * phrases to OpenSSL                                                 			
             */                                                                   			
            if ((fp = fopen(lo->ldo_tls_keyfile, "r")) == NULL) {                             			
                success = 0;                                                      			
            } else {                                                              			
                privatekey = SSL_read_PrivateKey(fp, NULL,                        			
                                                 tlso_pphrase_cb);                                             			
                success = (privatekey != NULL ? 1 : 0);                           			
                fclose(fp);                                                       			
            }                                                                     			
            
            if (!success || !SSL_CTX_use_PrivateKey( lo->ldo_tls_ctx, privatekey ) )
            {
                Debug( LDAP_DEBUG_ANY,
                      "TLS: could not use key file `%s'.\n",
                      lo->ldo_tls_keyfile,0,0);
                tlso_report_error();
                return -1;                                                 			
            }
        }
#ifdef __APPLE__
    }

	/* Client path only.  If the server's certificate was previously found
	 * in the keychain, try to use.
         */
	if ( lo->ldo_tls_cert_ref ) {
		if ( !tlso_use_cert_from_keychain( lo ) ) {
		    return -1;
		}
	}
#endif

        if ( lo->ldo_tls_dhfile ) {
            DH *dh = NULL;
            BIO *bio;
            dhplist *p;
            
            if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
                Debug( LDAP_DEBUG_ANY,
                      "TLS: could not use DH parameters file `%s'.\n",
                      lo->ldo_tls_dhfile,0,0);
                tlso_report_error();
                return -1;
            }
            while (( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
                p = LDAP_MALLOC( sizeof(dhplist) );
                if ( p != NULL ) {
                    p->keylength = DH_size( dh ) * 8;
                    p->param = dh;
                    p->next = tlso_dhparams;
                    tlso_dhparams = p;
                }
            }
            BIO_free( bio );
        }

	if ( tlso_opt_trace ) {
		SSL_CTX_set_info_callback( ctx, tlso_info_cb );
	}

	i = SSL_VERIFY_NONE;
	if ( lo->ldo_tls_require_cert ) {
		i = SSL_VERIFY_PEER;
		if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
			 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) {
			i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
		}
	}

	SSL_CTX_set_verify( ctx, i,
		lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
		tlso_verify_ok : tlso_verify_cb );
	SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
	if ( lo->ldo_tls_dhfile ) {
		SSL_CTX_set_tmp_dh_callback( ctx, tlso_tmp_dh_cb );
	}
#ifdef HAVE_OPENSSL_CRL
	if ( lo->ldo_tls_crlcheck ) {
		X509_STORE *x509_s = SSL_CTX_get_cert_store( ctx );
		if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) {
			X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK );
		} else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) {
			X509_STORE_set_flags( x509_s, 
					X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL  );
		}
	}
#endif
	return 0;
}

static tls_session *
tlso_session_new( tls_ctx *ctx, int is_server )
{
	tlso_ctx *c = (tlso_ctx *)ctx;
	return (tls_session *)SSL_new( c );
}

static int
tlso_session_connect( LDAP *ld, tls_session *sess )
{
	tlso_session *s = (tlso_session *)sess;

	/* Caller expects 0 = success, OpenSSL returns 1 = success */
	return SSL_connect( s ) - 1;
}

static int
tlso_session_accept( tls_session *sess )
{
	tlso_session *s = (tlso_session *)sess;

	/* Caller expects 0 = success, OpenSSL returns 1 = success */
	return SSL_accept( s ) - 1;
}

static int
tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc )
{
	tlso_session *s = (tlso_session *)sess;

	/* 1 was subtracted above, offset it back now */
	rc = SSL_get_error(s, rc+1);
	if (rc == SSL_ERROR_WANT_READ) {
		sb->sb_trans_needs_read  = 1;
		return 1;

	} else if (rc == SSL_ERROR_WANT_WRITE) {
		sb->sb_trans_needs_write = 1;
		return 1;

	} else if (rc == SSL_ERROR_WANT_CONNECT) {
		return 1;
	}
	return 0;
}

static char *
tlso_session_errmsg( tls_session *sess, int rc, char *buf, size_t len )
{
	char err[256] = "";
	const char *certerr=NULL;
	tlso_session *s = (tlso_session *)sess;

	rc = ERR_peek_error();
	if ( rc ) {
		ERR_error_string_n( rc, err, sizeof(err) );
		if ( ( ERR_GET_LIB(rc) == ERR_LIB_SSL ) && 
				( ERR_GET_REASON(rc) == SSL_R_CERTIFICATE_VERIFY_FAILED ) ) {
			int certrc = SSL_get_verify_result(s);
			certerr = (char *)X509_verify_cert_error_string(certrc);
		}
		snprintf(buf, len, "%s%s%s%s", err, certerr ? " (" :"", 
				certerr ? certerr : "", certerr ?  ")" : "" );
		return buf;
	}
	return NULL;
}

static int
tlso_session_my_dn( tls_session *sess, struct berval *der_dn )
{
	tlso_session *s = (tlso_session *)sess;
	X509 *x;
	X509_NAME *xn;

	x = SSL_get_certificate( s );

	if (!x) return LDAP_INVALID_CREDENTIALS;
	
	xn = X509_get_subject_name(x);
	der_dn->bv_len = i2d_X509_NAME( xn, NULL );
	der_dn->bv_val = xn->bytes->data;
	/* Don't X509_free, the session is still using it */
	return 0;
}

static X509 *
tlso_get_cert( SSL *s )
{
	/* If peer cert was bad, treat as if no cert was given */
	if (SSL_get_verify_result(s)) {
		return NULL;
	}
	return SSL_get_peer_certificate(s);
}

static int
tlso_session_peer_dn( tls_session *sess, struct berval *der_dn )
{
	tlso_session *s = (tlso_session *)sess;
	X509 *x = tlso_get_cert( s );
	X509_NAME *xn;

	if ( !x )
		return LDAP_INVALID_CREDENTIALS;

	xn = X509_get_subject_name(x);
	der_dn->bv_len = i2d_X509_NAME( xn, NULL );
	der_dn->bv_val = xn->bytes->data;
	X509_free(x);
	return 0;
}

/* what kind of hostname were we given? */
#define	IS_DNS	0
#define	IS_IP4	1
#define	IS_IP6	2

static int
tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in )
{
	tlso_session *s = (tlso_session *)sess;
	int i, ret = LDAP_LOCAL_ERROR;
	X509 *x;
	const char *name;
	char *ptr;
	int ntype = IS_DNS, nlen;
#ifdef LDAP_PF_INET6
	struct in6_addr addr;
#else
	struct in_addr addr;
#endif

	if( ldap_int_hostname &&
		( !name_in || !strcasecmp( name_in, "localhost" ) ) )
	{
		name = ldap_int_hostname;
	} else {
		name = name_in;
	}
	nlen = strlen(name);

	x = tlso_get_cert(s);
	if (!x) {
		Debug( LDAP_DEBUG_ANY,
			"TLS: unable to get peer certificate.\n",
			0, 0, 0 );
		/* If this was a fatal condition, things would have
		 * aborted long before now.
		 */
		return LDAP_SUCCESS;
	}

#ifdef LDAP_PF_INET6
	if (name[0] == '[' && strchr(name, ']')) {
		char *n2 = ldap_strdup(name+1);
		*strchr(n2, ']') = 0;
		if (inet_pton(AF_INET6, n2, &addr))
			ntype = IS_IP6;
		LDAP_FREE(n2);
	} else 
#endif
	if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
		if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
	}
	
	i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
	if (i >= 0) {
		X509_EXTENSION *ex;
		STACK_OF(GENERAL_NAME) *alt;

		ex = X509_get_ext(x, i);
		alt = X509V3_EXT_d2i(ex);
		if (alt) {
			int n, len2 = 0;
			char *domain = NULL;
			GENERAL_NAME *gn;

			if (ntype == IS_DNS) {
				domain = strchr(name, '.');
				if (domain) {
					len2 = nlen - (domain-name);
				}
			}
			n = sk_GENERAL_NAME_num(alt);
			for (i=0; i<n; i++) {
				char *sn;
				int sl;
				gn = sk_GENERAL_NAME_value(alt, i);
				if (gn->type == GEN_DNS) {
					if (ntype != IS_DNS) continue;

					sn = (char *) ASN1_STRING_data(gn->d.ia5);
					sl = ASN1_STRING_length(gn->d.ia5);

					/* ignore empty */
					if (sl == 0) continue;

					/* Is this an exact match? */
					if ((nlen == sl) && !strncasecmp(name, sn, nlen)) {
						break;
					}

					/* Is this a wildcard match? */
					if (domain && (sn[0] == '*') && (sn[1] == '.') &&
						(len2 == sl-1) && !strncasecmp(domain, &sn[1], len2))
					{
						break;
					}

				} else if (gn->type == GEN_IPADD) {
					if (ntype == IS_DNS) continue;

					sn = (char *) ASN1_STRING_data(gn->d.ia5);
					sl = ASN1_STRING_length(gn->d.ia5);

#ifdef LDAP_PF_INET6
					if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) {
						continue;
					} else
#endif
					if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) {
						continue;
					}
					if (!memcmp(sn, &addr, sl)) {
						break;
					}
				}
			}

			GENERAL_NAMES_free(alt);
			if (i < n) {	/* Found a match */
				ret = LDAP_SUCCESS;
			}
		}
	}

	if (ret != LDAP_SUCCESS) {
		X509_NAME *xn;
		X509_NAME_ENTRY *ne;
		ASN1_OBJECT *obj;
		ASN1_STRING *cn = NULL;
		int navas;

		/* find the last CN */
		obj = OBJ_nid2obj( NID_commonName );
		if ( !obj ) goto no_cn;	/* should never happen */

		xn = X509_get_subject_name(x);
		navas = X509_NAME_entry_count( xn );
		for ( i=navas-1; i>=0; i-- ) {
			ne = X509_NAME_get_entry( xn, i );
			if ( !OBJ_cmp( ne->object, obj )) {
				cn = X509_NAME_ENTRY_get_data( ne );
				break;
			}
		}

		if( !cn )
		{
no_cn:
			Debug( LDAP_DEBUG_ANY,
				"TLS: unable to get common name from peer certificate.\n",
				0, 0, 0 );
			ret = LDAP_CONNECT_ERROR;
			if ( ld->ld_error ) {
				LDAP_FREE( ld->ld_error );
			}
			ld->ld_error = LDAP_STRDUP(
				_("TLS: unable to get CN from peer certificate"));

		} else if ( cn->length == nlen &&
			strncasecmp( name, (char *) cn->data, nlen ) == 0 ) {
			ret = LDAP_SUCCESS;

		} else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) {
			char *domain = strchr(name, '.');
			if( domain ) {
				int dlen;

				dlen = nlen - (domain-name);

				/* Is this a wildcard match? */
				if ((dlen == cn->length-1) &&
					!strncasecmp(domain, (char *) &cn->data[1], dlen)) {
					ret = LDAP_SUCCESS;
				}
			}
		}

		if( ret == LDAP_LOCAL_ERROR ) {
			Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
				"common name in certificate (%.*s).\n", 
				name, cn->length, cn->data );
			ret = LDAP_CONNECT_ERROR;
			if ( ld->ld_error ) {
				LDAP_FREE( ld->ld_error );
			}
			ld->ld_error = LDAP_STRDUP(
				_("TLS: hostname does not match CN in peer certificate"));
		}
	}
	X509_free(x);
	return ret;
}

static int
tlso_session_strength( tls_session *sess )
{
	tlso_session *s = (tlso_session *)sess;
	SSL_CIPHER *c;

	c = SSL_get_current_cipher(s);
	return SSL_CIPHER_get_bits(c, NULL);
}

/*
 * TLS support for LBER Sockbufs
 */

struct tls_data {
	tlso_session		*session;
	Sockbuf_IO_Desc		*sbiod;
};

static int
tlso_bio_create( BIO *b ) {
	b->init = 1;
	b->num = 0;
	b->ptr = NULL;
	b->flags = 0;
	return 1;
}

static int
tlso_bio_destroy( BIO *b )
{
	if ( b == NULL ) return 0;

	b->ptr = NULL;		/* sb_tls_remove() will free it */
	b->init = 0;
	b->flags = 0;
	return 1;
}

static int
tlso_bio_read( BIO *b, char *buf, int len )
{
	struct tls_data		*p;
	int			ret;
		
	if ( buf == NULL || len <= 0 ) return 0;

	p = (struct tls_data *)b->ptr;

	if ( p == NULL || p->sbiod == NULL ) {
		return 0;
	}

	ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );

	BIO_clear_retry_flags( b );
	if ( ret < 0 ) {
		int err = sock_errno();
		if ( err == EAGAIN || err == EWOULDBLOCK ) {
			BIO_set_retry_read( b );
		}
	}

	return ret;
}

static int
tlso_bio_write( BIO *b, const char *buf, int len )
{
	struct tls_data		*p;
	int			ret;
	
	if ( buf == NULL || len <= 0 ) return 0;
	
	p = (struct tls_data *)b->ptr;

	if ( p == NULL || p->sbiod == NULL ) {
		return 0;
	}

	ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );

	BIO_clear_retry_flags( b );
	if ( ret < 0 ) {
		int err = sock_errno();
		if ( err == EAGAIN || err == EWOULDBLOCK ) {
			BIO_set_retry_write( b );
		}
	}

	return ret;
}

static long
tlso_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
{
	if ( cmd == BIO_CTRL_FLUSH ) {
		/* The OpenSSL library needs this */
		return 1;
	}
	return 0;
}

static int
tlso_bio_gets( BIO *b, char *buf, int len )
{
	return -1;
}

static int
tlso_bio_puts( BIO *b, const char *str )
{
	return tlso_bio_write( b, str, strlen( str ) );
}
	
static BIO_METHOD tlso_bio_method =
{
	( 100 | 0x400 ),		/* it's a source/sink BIO */
	"sockbuf glue",
	tlso_bio_write,
	tlso_bio_read,
	tlso_bio_puts,
	tlso_bio_gets,
	tlso_bio_ctrl,
	tlso_bio_create,
	tlso_bio_destroy
};

static int
tlso_sb_setup( Sockbuf_IO_Desc *sbiod, void *arg )
{
	struct tls_data		*p;
	BIO			*bio;

	assert( sbiod != NULL );

	p = LBER_MALLOC( sizeof( *p ) );
	if ( p == NULL ) {
		return -1;
	}
	
	p->session = arg;
	p->sbiod = sbiod;
	bio = BIO_new( &tlso_bio_method );
	bio->ptr = (void *)p;
	SSL_set_bio( p->session, bio, bio );
	sbiod->sbiod_pvt = p;
	return 0;
}

static int
tlso_sb_remove( Sockbuf_IO_Desc *sbiod )
{
	struct tls_data		*p;
	
	assert( sbiod != NULL );
	assert( sbiod->sbiod_pvt != NULL );

	p = (struct tls_data *)sbiod->sbiod_pvt;
	SSL_free( p->session );
	LBER_FREE( sbiod->sbiod_pvt );
	sbiod->sbiod_pvt = NULL;
	return 0;
}

static int
tlso_sb_close( Sockbuf_IO_Desc *sbiod )
{
	struct tls_data		*p;
	
	assert( sbiod != NULL );
	assert( sbiod->sbiod_pvt != NULL );

	p = (struct tls_data *)sbiod->sbiod_pvt;
	SSL_shutdown( p->session );
	return 0;
}

static int
tlso_sb_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
{
	struct tls_data		*p;
	
	assert( sbiod != NULL );
	assert( sbiod->sbiod_pvt != NULL );

	p = (struct tls_data *)sbiod->sbiod_pvt;
	
	if ( opt == LBER_SB_OPT_GET_SSL ) {
		*((tlso_session **)arg) = p->session;
		return 1;

	} else if ( opt == LBER_SB_OPT_DATA_READY ) {
		if( SSL_pending( p->session ) > 0 ) {
			return 1;
		}
	}
	
	return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
}

static ber_slen_t
tlso_sb_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
	struct tls_data		*p;
	ber_slen_t		ret;
	int			err;

	assert( sbiod != NULL );
	assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );

	p = (struct tls_data *)sbiod->sbiod_pvt;

	ret = SSL_read( p->session, (char *)buf, len );
#ifdef HAVE_WINSOCK
	errno = WSAGetLastError();
#endif
	err = SSL_get_error( p->session, ret );
	if (err == SSL_ERROR_WANT_READ ) {
		sbiod->sbiod_sb->sb_trans_needs_read = 1;
		sock_errset(EWOULDBLOCK);
	}
	else
		sbiod->sbiod_sb->sb_trans_needs_read = 0;
	return ret;
}

static ber_slen_t
tlso_sb_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
	struct tls_data		*p;
	ber_slen_t		ret;
	int			err;

	assert( sbiod != NULL );
	assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );

	p = (struct tls_data *)sbiod->sbiod_pvt;

	ret = SSL_write( p->session, (char *)buf, len );
#ifdef HAVE_WINSOCK
	errno = WSAGetLastError();
#endif
	err = SSL_get_error( p->session, ret );
	if (err == SSL_ERROR_WANT_WRITE ) {
		sbiod->sbiod_sb->sb_trans_needs_write = 1;
		sock_errset(EWOULDBLOCK);

	} else {
		sbiod->sbiod_sb->sb_trans_needs_write = 0;
	}
	return ret;
}

static Sockbuf_IO tlso_sbio =
{
	tlso_sb_setup,		/* sbi_setup */
	tlso_sb_remove,		/* sbi_remove */
	tlso_sb_ctrl,		/* sbi_ctrl */
	tlso_sb_read,		/* sbi_read */
	tlso_sb_write,		/* sbi_write */
	tlso_sb_close		/* sbi_close */
};

/* Derived from openssl/apps/s_cb.c */
static void
tlso_info_cb( const SSL *ssl, int where, int ret )
{
	int w;
	char *op;
	char *state = (char *) SSL_state_string_long( (SSL *)ssl );

	w = where & ~SSL_ST_MASK;
	if ( w & SSL_ST_CONNECT ) {
		op = "SSL_connect";
	} else if ( w & SSL_ST_ACCEPT ) {
		op = "SSL_accept";
	} else {
		op = "undefined";
	}

#ifdef HAVE_EBCDIC
	if ( state ) {
		state = LDAP_STRDUP( state );
		__etoa( state );
	}
#endif
	if ( where & SSL_CB_LOOP ) {
		Debug( LDAP_DEBUG_TRACE,
			   "TLS trace: %s:%s\n",
			   op, state, 0 );

	} else if ( where & SSL_CB_ALERT ) {
		char *atype = (char *) SSL_alert_type_string_long( ret );
		char *adesc = (char *) SSL_alert_desc_string_long( ret );
		op = ( where & SSL_CB_READ ) ? "read" : "write";
#ifdef HAVE_EBCDIC
		if ( atype ) {
			atype = LDAP_STRDUP( atype );
			__etoa( atype );
		}
		if ( adesc ) {
			adesc = LDAP_STRDUP( adesc );
			__etoa( adesc );
		}
#endif
		Debug( LDAP_DEBUG_TRACE,
			   "TLS trace: SSL3 alert %s:%s:%s\n",
			   op, atype, adesc );
#ifdef HAVE_EBCDIC
		if ( atype ) LDAP_FREE( atype );
		if ( adesc ) LDAP_FREE( adesc );
#endif
	} else if ( where & SSL_CB_EXIT ) {
		if ( ret == 0 ) {
			Debug( LDAP_DEBUG_TRACE,
				   "TLS trace: %s:failed in %s\n",
				   op, state, 0 );
		} else if ( ret < 0 ) {
			Debug( LDAP_DEBUG_TRACE,
				   "TLS trace: %s:error in %s\n",
				   op, state, 0 );
		}
	}
#ifdef HAVE_EBCDIC
	if ( state ) LDAP_FREE( state );
#endif
}

static int
tlso_verify_cb( int ok, X509_STORE_CTX *ctx )
{
	X509 *cert;
	int errnum;
	int errdepth;
	X509_NAME *subject;
	X509_NAME *issuer;
	char *sname;
	char *iname;
	char *certerr = NULL;

	cert = X509_STORE_CTX_get_current_cert( ctx );
	errnum = X509_STORE_CTX_get_error( ctx );
	errdepth = X509_STORE_CTX_get_error_depth( ctx );

	/*
	 * X509_get_*_name return pointers to the internal copies of
	 * those things requested.  So do not free them.
	 */
	subject = X509_get_subject_name( cert );
	issuer = X509_get_issuer_name( cert );
	/* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
	sname = X509_NAME_oneline( subject, NULL, 0 );
	iname = X509_NAME_oneline( issuer, NULL, 0 );
	if ( !ok ) certerr = (char *)X509_verify_cert_error_string( errnum );
#ifdef HAVE_EBCDIC
	if ( sname ) __etoa( sname );
	if ( iname ) __etoa( iname );
	if ( certerr ) {
		certerr = LDAP_STRDUP( certerr );
		__etoa( certerr );
	}
#endif
	Debug( LDAP_DEBUG_TRACE,
		   "TLS certificate verification: depth: %d, err: %d, subject: %s,",
		   errdepth, errnum,
		   sname ? sname : "-unknown-" );
	Debug( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-", 0, 0 );
	if ( !ok ) {
		Debug( LDAP_DEBUG_ANY,
			"TLS certificate verification: Error, %s\n",
			certerr, 0, 0 );
	}
	if ( sname )
		CRYPTO_free ( sname );
	if ( iname )
		CRYPTO_free ( iname );
#ifdef HAVE_EBCDIC
	if ( certerr ) LDAP_FREE( certerr );
#endif
	return ok;
}

static int
tlso_verify_ok( int ok, X509_STORE_CTX *ctx )
{
	(void) tlso_verify_cb( ok, ctx );
	return 1;
}

/* Inspired by ERR_print_errors in OpenSSL */
static void
tlso_report_error( void )
{
	unsigned long l;
	char buf[200];
	const char *file;
	int line;

	while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
		ERR_error_string_n( l, buf, sizeof( buf ) );
#ifdef HAVE_EBCDIC
		if ( file ) {
			file = LDAP_STRDUP( file );
			__etoa( (char *)file );
		}
		__etoa( buf );
#endif
		Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
			buf, file, line );
#ifdef HAVE_EBCDIC
		if ( file ) LDAP_FREE( (void *)file );
#endif
	}
}

static RSA *
tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
{
	RSA *tmp_rsa;
	/* FIXME:  Pregenerate the key on startup */
	/* FIXME:  Who frees the key? */
#if OPENSSL_VERSION_NUMBER >= 0x00908000
	BIGNUM *bn = BN_new();
	tmp_rsa = NULL;
	if ( bn ) {
		if ( BN_set_word( bn, RSA_F4 )) {
			tmp_rsa = RSA_new();
			if ( tmp_rsa && !RSA_generate_key_ex( tmp_rsa, key_length, bn, NULL )) {
				RSA_free( tmp_rsa );
				tmp_rsa = NULL;
			}
		}
		BN_free( bn );
	}
#else
	tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
#endif

	if ( !tmp_rsa ) {
		Debug( LDAP_DEBUG_ANY,
			"TLS: Failed to generate temporary %d-bit %s RSA key\n",
			key_length, is_export ? "export" : "domestic", 0 );
	}
	return tmp_rsa;
}

static int
tlso_seed_PRNG( const char *randfile )
{
#ifndef URANDOM_DEVICE
	/* no /dev/urandom (or equiv) */
	long total=0;
	char buffer[MAXPATHLEN];

	if (randfile == NULL) {
		/* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
		 * If $HOME is not set or buffer too small to hold the pathname,
		 * an error occurs.	- From RAND_file_name() man page.
		 * The fact is that when $HOME is NULL, .rnd is used.
		 */
		randfile = RAND_file_name( buffer, sizeof( buffer ) );

	} else if (RAND_egd(randfile) > 0) {
		/* EGD socket */
		return 0;
	}

	if (randfile == NULL) {
		Debug( LDAP_DEBUG_ANY,
			"TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
			0, 0, 0);
		return -1;
	}

	total = RAND_load_file(randfile, -1);

	if (RAND_status() == 0) {
		Debug( LDAP_DEBUG_ANY,
			"TLS: PRNG not been seeded with enough data\n",
			0, 0, 0);
		return -1;
	}

	/* assume if there was enough bits to seed that it's okay
	 * to write derived bits to the file
	 */
	RAND_write_file(randfile);

#endif

	return 0;
}

struct dhinfo {
	int keylength;
	const char *pem;
	size_t size;
};


/* From the OpenSSL 0.9.7 distro */
static const char tlso_dhpem512[] =
"-----BEGIN DH PARAMETERS-----\n\
MEYCQQDaWDwW2YUiidDkr3VvTMqS3UvlM7gE+w/tlO+cikQD7VdGUNNpmdsp13Yn\n\
a6LT1BLiGPTdHghM9tgAPnxHdOgzAgEC\n\
-----END DH PARAMETERS-----\n";

static const char tlso_dhpem1024[] =
"-----BEGIN DH PARAMETERS-----\n\
MIGHAoGBAJf2QmHKtQXdKCjhPx1ottPb0PMTBH9A6FbaWMsTuKG/K3g6TG1Z1fkq\n\
/Gz/PWk/eLI9TzFgqVAuPvr3q14a1aZeVUMTgo2oO5/y2UHe6VaJ+trqCTat3xlx\n\
/mNbIK9HA2RgPC3gWfVLZQrY+gz3ASHHR5nXWHEyvpuZm7m3h+irAgEC\n\
-----END DH PARAMETERS-----\n";

static const char tlso_dhpem2048[] =
"-----BEGIN DH PARAMETERS-----\n\
MIIBCAKCAQEA7ZKJNYJFVcs7+6J2WmkEYb8h86tT0s0h2v94GRFS8Q7B4lW9aG9o\n\
AFO5Imov5Jo0H2XMWTKKvbHbSe3fpxJmw/0hBHAY8H/W91hRGXKCeyKpNBgdL8sh\n\
z22SrkO2qCnHJ6PLAMXy5fsKpFmFor2tRfCzrfnggTXu2YOzzK7q62bmqVdmufEo\n\
pT8igNcLpvZxk5uBDvhakObMym9mX3rAEBoe8PwttggMYiiw7NuJKO4MqD1llGkW\n\
aVM8U2ATsCun1IKHrRxynkE1/MJ86VHeYYX8GZt2YA8z+GuzylIOKcMH6JAWzMwA\n\
Gbatw6QwizOhr9iMjZ0B26TE3X8LvW84wwIBAg==\n\
-----END DH PARAMETERS-----\n";

static const char tlso_dhpem4096[] =
"-----BEGIN DH PARAMETERS-----\n\
MIICCAKCAgEA/urRnb6vkPYc/KEGXWnbCIOaKitq7ySIq9dTH7s+Ri59zs77zty7\n\
vfVlSe6VFTBWgYjD2XKUFmtqq6CqXMhVX5ElUDoYDpAyTH85xqNFLzFC7nKrff/H\n\
TFKNttp22cZE9V0IPpzedPfnQkE7aUdmF9JnDyv21Z/818O93u1B4r0szdnmEvEF\n\
bKuIxEHX+bp0ZR7RqE1AeifXGJX3d6tsd2PMAObxwwsv55RGkn50vHO4QxtTARr1\n\
rRUV5j3B3oPMgC7Offxx+98Xn45B1/G0Prp11anDsR1PGwtaCYipqsvMwQUSJtyE\n\
EOQWk+yFkeMe4vWv367eEi0Sd/wnC+TSXBE3pYvpYerJ8n1MceI5GQTdarJ77OW9\n\
bGTHmxRsLSCM1jpLdPja5jjb4siAa6EHc4qN9c/iFKS3PQPJEnX7pXKBRs5f7AF3\n\
W3RIGt+G9IVNZfXaS7Z/iCpgzgvKCs0VeqN38QsJGtC1aIkwOeyjPNy2G6jJ4yqH\n\
ovXYt/0mc00vCWeSNS1wren0pR2EiLxX0ypjjgsU1mk/Z3b/+zVf7fZSIB+nDLjb\n\
NPtUlJCVGnAeBK1J1nG3TQicqowOXoM6ISkdaXj5GPJdXHab2+S7cqhKGv5qC7rR\n\
jT6sx7RUr0CNTxzLI7muV2/a4tGmj0PSdXQdsZ7tw7gbXlaWT1+MM2MCAQI=\n\
-----END DH PARAMETERS-----\n";

static const struct dhinfo tlso_dhpem[] = {
	{ 512, tlso_dhpem512, sizeof(tlso_dhpem512) },
	{ 1024, tlso_dhpem1024, sizeof(tlso_dhpem1024) },
	{ 2048, tlso_dhpem2048, sizeof(tlso_dhpem2048) },
	{ 4096, tlso_dhpem4096, sizeof(tlso_dhpem4096) },
	{ 0, NULL, 0 }
};

static DH *
tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
{
	struct dhplist *p = NULL;
	BIO *b = NULL;
	DH *dh = NULL;
	int i;

	/* Do we have params of this length already? */
	LDAP_MUTEX_LOCK( &tlso_dh_mutex );
	for ( p = tlso_dhparams; p; p=p->next ) {
		if ( p->keylength == key_length ) {
			LDAP_MUTEX_UNLOCK( &tlso_dh_mutex );
			return p->param;
		}
	}

	/* No - check for hardcoded params */

	for (i=0; tlso_dhpem[i].keylength; i++) {
		if ( tlso_dhpem[i].keylength == key_length ) {
			b = BIO_new_mem_buf( (char *)tlso_dhpem[i].pem, tlso_dhpem[i].size );
			break;
		}
	}

	if ( b ) {
		dh = PEM_read_bio_DHparams( b, NULL, NULL, NULL );
		BIO_free( b );
	}

	/* Generating on the fly is expensive/slow... */
	if ( !dh ) {
		dh = DH_generate_parameters( key_length, DH_GENERATOR_2, NULL, NULL );
	}
	if ( dh ) {
		p = LDAP_MALLOC( sizeof(struct dhplist) );
		if ( p != NULL ) {
			p->keylength = key_length;
			p->param = dh;
			p->next = tlso_dhparams;
			tlso_dhparams = p;
		}
	}

	LDAP_MUTEX_UNLOCK( &tlso_dh_mutex );
	return dh;
}

tls_impl ldap_int_tls_impl = {
	"OpenSSL",

	tlso_init,
	tlso_destroy,

	tlso_ctx_new,
	tlso_ctx_ref,
	tlso_ctx_free,
	tlso_ctx_init,

	tlso_session_new,
	tlso_session_connect,
	tlso_session_accept,
	tlso_session_upflags,
	tlso_session_errmsg,
	tlso_session_my_dn,
	tlso_session_peer_dn,
	tlso_session_chkhost,
	tlso_session_strength,

	&tlso_sbio,

#ifdef LDAP_R_COMPILE
	tlso_thr_init,
#else
	NULL,
#endif

	0
};

#ifdef __APPLE__
static int
tlso_use_cert_from_keychain( struct ldapoptions *lo )
{
	if ( lo == NULL || lo->ldo_tls_cert_ref == NULL ) {
		return 0;
	}

	CFDataRef certificateCFData = NULL;
	OSStatus status = SecKeychainItemExport( lo->ldo_tls_cert_ref,
						 kSecFormatX509Cert,
						 0,
						 NULL,
						 &certificateCFData );
	if ( status != noErr ) {
		Debug( LDAP_DEBUG_ANY,
		       "%s: SecKeychainItemExport(certificateRef) failed: %d\n",
		       __PRETTY_FUNCTION__, (int)status, 0 );
		syslog( LOG_ERR, "%s: SecKeychainItemExport(certificateRef): %d",
			__PRETTY_FUNCTION__, (int)status, 0 );
		cssmPerror( "SecKeychainItemExport(certificateRef)", status );
		return 0;
	}

	/* Put the data into a C array so openssl can use it. */
	int rc = 0;
	unsigned char *certificateData = NULL;
	int certificateDataLen = CFDataGetLength( certificateCFData );
	if ( certificateDataLen ) {
		certificateData = LDAP_MALLOC( certificateDataLen * sizeof(*certificateData) );
		if ( certificateData ) {
			CFDataGetBytes( certificateCFData,
					CFRangeMake(0, certificateDataLen),
					certificateData );

			rc = SSL_CTX_use_certificate_ASN1( lo->ldo_tls_ctx,
							   certificateDataLen,
							   certificateData );
			if ( !rc ) {
				Debug( LDAP_DEBUG_ANY,
				       "TLS: could not use keychain certificate data in SSL_CTX_use_certificate_ASN1\n",
				       0,0,0);
				tlso_report_error();
			}
			else {
				Debug( LDAP_DEBUG_ANY,
				       "TLS: using keychain certificate data\n",
				       0, 0, 0);
			}
			LDAP_FREE( certificateData );
		}
	}
	CFRelease( certificateCFData );

	return rc;
}

static X509 *tslo_copy_cert_to_x509(SecCertificateRef inRef)
{
	X509 *result = NULL;
	const unsigned char *buf = NULL;
	CFDataRef	DERCertData = SecCertificateCopyData(inRef);
	CFIndex	len = 0;
	if(DERCertData == NULL) return NULL;
	
	len = CFDataGetLength(DERCertData);
	buf = (const unsigned char *)CFDataGetBytePtr(DERCertData);
	
	result = d2i_X509(NULL, &buf, len);
	CFRelease(DERCertData);
	return result;
}

static EVP_PKEY	*tslo_copy_key_to_evpkey(SecKeyRef inKey)
{
	OSStatus ortn = 0;
	EVP_PKEY *result = NULL;
	SecItemImportExportKeyParameters	params;
	CFDataRef	intermediateData = NULL;
	BIO	*intermediateBIO = NULL;
	char* cExportPass = ";aweCrugf99;uvPvh8229fliaYnx``1";
        CFStringRef cfExportPass = NULL;
	
        cfExportPass = CFStringCreateWithCString(NULL, cExportPass, kCFStringEncodingUTF8);
        if (!cfExportPass) {
                syslog(LOG_DEBUG, "TLS: Unable to create CFString private key passphrase.");
                return NULL;
        }

	memset(&params, 0, sizeof(params));        
	params.version = SEC_KEY_IMPORT_EXPORT_PARAMS_VERSION;
	params.flags = 0;
	params.passphrase = cfExportPass;
	
        ortn = SecItemExport(inKey, kSecFormatWrappedPKCS8, 0, &params, (CFDataRef*)&intermediateData);
        if(ortn != 0) {
                syslog( LOG_DEBUG, "TLS: Unable to export private key.");
                CFRelease(cfExportPass);
                return NULL;
        }
	
	intermediateBIO = BIO_new_mem_buf((void *)CFDataGetBytePtr(intermediateData), CFDataGetLength(intermediateData));
	if(intermediateBIO == NULL) 
	{	
                syslog( LOG_DEBUG, "TLS: Unable to create BIO buffer for private key data.");
                CFRelease(cfExportPass);
		CFRelease(intermediateData);
		return NULL;
	}

	result = d2i_PKCS8PrivateKey_bio(intermediateBIO, NULL, NULL, cExportPass);
	if(result == NULL)
	{
                char errbuf[512];
                ERR_error_string(ERR_get_error(), errbuf);
                syslog( LOG_DEBUG, "TLS: Unable to use passphrase for private key: %s.", errbuf);
	}

	BIO_free_all(intermediateBIO);
	CFRelease(intermediateData);
        CFRelease(cfExportPass);
    
	return result;
}

static OSStatus tslo_create_ca_chain(SSL_CTX* ctx, SecCertificateRef sslCertRef)
{
	OSStatus status = noErr;
	CFMutableArrayRef certChain = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	SecPolicyRef policy = SecPolicyCreateBasicX509();
    SecTrustRef trustRef = NULL;
	SecTrustResultType trustResult = NULL;
    X509* x509_cert = NULL;
    SSL_CTX_set_mode(ctx, SSL_MODE_NO_AUTO_CHAIN);
        
    do {
		if (sslCertRef) {
			CFArrayAppendValue(certChain, sslCertRef);
			status = SecTrustCreateWithCertificates(certChain, policy, &trustRef);
			if (status == noErr) {
				status =  SecTrustEvaluate(trustRef, &trustResult);
				if (status == noErr) {
					CFIndex count = SecTrustGetCertificateCount(trustRef);
					if (count) {
						int i;
						for (i = 0; i < count; i++) {
							SecCertificateRef certInChainRef = SecTrustGetCertificateAtIndex(trustRef, i);
							if (certInChainRef) {
								x509_cert = tslo_copy_cert_to_x509(certInChainRef);
								if(SSL_CTX_add_client_CA(ctx, x509_cert) < 1) {
									syslog( LOG_DEBUG, "[%s] TLS: could not load client CA name using SSL_CTX_add_client_CA ", __func__);
									tlso_report_error();
									status = -1;
									X509_free(x509_cert);
									break;
								}
								if(SSL_CTX_add_extra_chain_cert(ctx, x509_cert) < 1) {
									syslog( LOG_DEBUG, "[%s] TLS: could not load client CA name using SSL_CTX_add_extra_chain_cert ", __func__);
									tlso_report_error();
									status = -1;
									X509_free(x509_cert);
									break;
								}
							}
						}
					} else {
						syslog( LOG_DEBUG, "[%s] SecTrustGetCertificateCount  - No Certificates returned", __func__);
						status = -1;
						break;								
					}
				} else {
					syslog( LOG_DEBUG, "[%s] SecTrustEvaluate (ssl) err (%d) trustResult(%d)", __func__, status, trustResult);
					status = -1;
					break;			
				}			
			} else {
				syslog( LOG_DEBUG, "[%s] SecTrustCreateWithCertificates (ssl) err (%d)", __func__, status);
				status = -1;
				break;			
			}								
		}
    } while (0);

    if (certChain)
        CFRelease(certChain);
    if (policy)
        CFRelease(policy);
	if (trustRef)
		CFRelease(trustRef);
			
	return status;
}

#endif /*__APPLE__*/

#endif /* HAVE_OPENSSL */
